Use LTC7862 as surge stopper and pass MIL-STD-1275D

HI ADI Expert,

We would like use LTC786x as surge stopper and it need pass MIL-STD-1275D standard.

We picked LTC7860 first but we can't find 250V P-MOS with low RDson so Power dissipation is quote large.

Now we're studying LTC7862 which use N-MOS, but we can't find description about designing with floating ground.  ( It describes very clearly in LTC7860's datasheet )

May I know :

1. Does ADI provide LTC7862 reference design which pass MIL-STD-1275D standard?

2. Can you share more design note about designing LTC7862 with floating ground? 

Thank you!

Parents
  • +1
    •  Analog Employees 
    on Jul 1, 2019 11:11 PM

    At this time, ADI does not have a MIL-STD-1275D LTC7862 reference design. The input voltage of the LTC7862 is limited to 140V which will accommodate the 100V surge requirement, but not the 250V, 15mJ spike requirement. While it is likely possible to extend the input range of the LTC7862 with the use of a high-side driver (and bias supply), the N-Channel LTC7862 does not support the floating ground configuration used with the LTC7860.

Reply
  • +1
    •  Analog Employees 
    on Jul 1, 2019 11:11 PM

    At this time, ADI does not have a MIL-STD-1275D LTC7862 reference design. The input voltage of the LTC7862 is limited to 140V which will accommodate the 100V surge requirement, but not the 250V, 15mJ spike requirement. While it is likely possible to extend the input range of the LTC7862 with the use of a high-side driver (and bias supply), the N-Channel LTC7862 does not support the floating ground configuration used with the LTC7860.

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